Finding the Fourth Proportional to 13,523.08, 18,657.76 and 7,856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,523.08 : 18,657.76 = 7,856.72 : x
2. Step 2: Convert to fraction form
   13,523.08/18,657.76 = 7,856.72/x
3. Step 3: Cross multiply
   13,523.08x = 18,657.76 × 7,856.72
4. Step 4: Simplify right side
   13,523.08x = 146,588,796.15
5. Step 5: Solve for x
   x = 146,588,796.15/13,523.08
6. Step 6: Final answer
   x = 10,839.90